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A297937
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Number of nX2 0..1 arrays with every element equal to 0, 2, 3 or 5 king-move adjacent elements, with upper left element zero.
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8
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1, 5, 7, 18, 31, 65, 130, 253, 519, 1018, 2055, 4097, 8186, 16405, 32743, 65570, 131055, 262145, 524338, 1048493, 2097287, 4194186, 8388695, 16777281, 33554218, 67109317, 134217191, 268436018, 536870719, 1073741505, 2147484898, 4294965341
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OFFSET
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1,2
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COMMENTS
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Column 2 of A297943.
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = a(n-1) +3*a(n-2) -4*a(n-4) for n>5
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EXAMPLE
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Some solutions for n=7
..0..1. .0..0. .0..0. .0..1. .0..1. .0..0. .0..0. .0..0. .0..0. .0..0
..0..0. .1..0. .0..0. .0..0. .1..1. .0..1. .0..0. .0..0. .0..0. .1..0
..1..0. .1..1. .0..0. .1..1. .1..0. .1..1. .0..0. .0..0. .0..0. .1..1
..1..1. .0..0. .0..0. .1..0. .0..0. .0..1. .1..1. .1..1. .0..0. .1..0
..1..0. .0..0. .0..0. .0..0. .1..0. .0..0. .1..1. .1..0. .0..0. .0..0
..0..0. .1..1. .1..1. .1..1. .1..1. .1..1. .0..0. .0..0. .1..1. .1..0
..1..0. .1..0. .1..1. .1..1. .0..1. .1..0. .0..1. .1..0. .0..1. .1..1
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CROSSREFS
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Cf. A297943.
Sequence in context: A214414 A153192 A263878 * A337349 A028319 A116640
Adjacent sequences: A297934 A297935 A297936 * A297938 A297939 A297940
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Jan 09 2018
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STATUS
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approved
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